<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="add3.php">
    <input type="text" name="name1" placeholder="姓名"/>
    <input type="text" name="sex" placeholder="性别"/>
    <input type="text" name="age" placeholder="年龄"/>
    <input type="submit"/>

</form>
</body>
</html>